Authors: Changqing Liu Yingguang Li Xiaozhong Hao
Publish Date: 2016/10/29
Volume: 90, Issue: 9-12, Pages: 3119-3128
Abstract
During the machining process of largescaled and thinwalled parts such as aircraft structural parts the deformation is a relatively common phenomenon which seriously affects the machining quality of the parts and may lead the parts to be scrapped In this paper interim machining states of workpiece are considered in addition to final machining states for deformation control so as to improve the machining quality and part correct rate It is very important for largescaled and thinwalled parts to consider the interim machining states as considerable deformation has always occurred in interim machining states The difficulties of deformation control of interim machining states contain two aspects 1 how to assess whether interim machining states can satisfy process requirements for further machining and 2 how to adjust the tool paths adaptively for further machining so as to make the final machining states correct In order to address the above difficulties an adaptive machining approach based on inprocess inspection of interim machining states for largescaled and thinwalled complex aircraft structural parts is proposed in this paper The actual interim machining state is obtained based on inprocess inspection of machining states during the machining process the essential idea of this paper is that the final machining state of the workpiece can be guaranteed by adjusting the tool path based on the inspection of interim machining states which is realized by coordinating the dimensional tolerance and geometrical tolerance In order to realize the new idea the criterion for determining whether the interim machining state is suitable or not for further machining and the concept of expected final state are introduced Eventually the largescaled and thinwalled complex aircraft structural parts can be machined adaptively according to process requirements A typical largescaled and thinwalled complex aircraft structural part is used as a case to validate the proposed approach The results show that the dimensional error is 010 mm and the profile error is 006 mm which can meet the machining requirement of largescaled and thinwalled complex parts
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